Unity installer

install.ps1

function Check-Version()
{
  $file = $args[0]
  $lines = Get-Content "$file" -TotalCount 2
  return $lines[0].Trim(), $lines[1].Trim()
}

function Install-Component()
{
  $PATH = $args[0]
  $FILE = [System.IO.Path]::GetFileNameWithoutExtension($PATH)
  $exists = Test-Path "cache/$UNITY_VERSION/$FILE.exe"

  if (-Not $exists)
  {
    Write-Host "Downloading $FILE.exe"
    New-Item "cache/$UNITY_VERSION/" -type directory -force
    $client = New-Object System.Net.WebClient
    $client.DownloadFile("http://download.unity3d.com/download_unity/$UNITY_CHANGESET/$PATH", "cache/$UNITY_VERSION/$FILE.exe")
  }
  else
  {
    Write-Host "$FILE.exe already downloaded"
  }

  Start-Process -FilePath "./cache/$UNITY_VERSION/$FILE.exe" -ArgumentList '/S','/D=.\unity\' -Wait
}

function Is-Up-To-Date()
{
  $is_installed = Test-Path "unity/version.txt"
  if ($is_installed)
  {
    $installed = Check-Version(".\unity\version.txt")
    $changeset = $installed[0]
    $version = $installed[1]

    if (($UNITY_CHANGESET -eq $changeset) -and ($UNITY_VERSION -eq $version))
    {
      Write-Host "Requested version $UNITY_VERSION is already installed"
      return 1
    }
    else
    {
      Write-Host "Requested version /$UNITY_VERSION/ does not match installed version /$version/"
      return 0
    }
  }

  Write-Host "No local unity installation found"
  return 0
}

$UNITY = Check-Version("./current.txt")
$UNITY_CHANGESET = $UNITY[0]
$UNITY_VERSION = $UNITY[1]

if (Is-Up-To-Date)
{
  Exit 0
}

Install-Component "Windows64EditorInstaller/UnitySetup64.exe"
Install-Component "WindowsDocumentationInstaller/UnityDocumentationSetup.exe"
Install-Component "WindowsStandardAssetsInstaller/UnityStandardAssetsSetup.exe"
Install-Component "TargetSupportInstaller/UnitySetup-Windows-Support-for-Editor-$UNITY_VERSION.exe"
Install-Component "TargetSupportInstaller/UnitySetup-Android-Support-for-Editor-$UNITY_VERSION.exe"
Install-Component "TargetSupportInstaller/UnitySetup-iOS-Support-for-Editor-$UNITY_VERSION.exe"

Out-File -FilePath .\unity\version.txt -InputObject "$UNITY_CHANGESET`r`n$UNITY_VERSION"

install.sh

UNITY_CHANGESET=$(sed -n '1p' ./current.txt)
UNITY_VERSION=$(sed -n '2p' ./current.txt)

function check_version() {
  if [[ ! -f ./unity/version.txt ]]
  then
    return 1
  fi


  changeset=$(sed -n '1p' ./unity/version.txt)
  version=$(sed -n '2p' ./unity/version.txt)

  if [[ $changeset == $UNITY_CHANGESET ]] && [[ $version == $UNITY_VERSION ]]
  then
    echo "Already up to date"
    return 0
  else
    return 1
  fi
}

function install() {
  path=$1
  file="cache/${UNITY_VERSION}/$(basename $path)"
  mkdir -p "cache/${UNITY_VERSION}"
  curl "http://download.unity3d.com/download_unity/${UNITY_CHANGESET}/${path}" > "${file}"
  sudo installer -package "${file}" -target /
}

if check_version
then
  exit 0
fi

install "MacEditorInstaller/Unity.pkg"
install "MacDocumentationInstaller/Documentation.pkg"
install "MacExampleProjectInstaller/Examples.pkg"
install "MacStandardAssetsInstaller/StandardAssets.pkg"

install "MacEditorTargetInstaller/UnitySetup-Android-Support-for-Editor-${UNITY_VERSION}.pkg"
install "MacEditorTargetInstaller/UnitySetup-iOS-Support-for-Editor-${UNITY_VERSION}.pkg"
install "MacEditorTargetInstaller/UnitySetup-Windows-Support-for-Editor-${UNITY_VERSION}.pkg"

echo $UNITY_CHANGESET > unity/version.txt
echo -n $UNITY_VERSION >> unity/version.txt